The Hollywood-born actress, 43, and New Yorker Baumbach, 35, became husband and wife in an undisclosed location over the Labor Day weekend (03-05SEP05).
Ecstatic Baumbach confirmed the nuptials had taken place to US magazine People at the New York Film Festival premiere of his drama The Squid and the Whale on Monday night (26SEP05).
He enthused, "I expect to be with her the rest of my life."
The couple plan to split their time between Leigh's home state of California and Baumbach's beloved Big Apple.
He explains, "We're New Yorkers with a country place in Los Angeles."